FS 91 - $369.95 DSRP


Distributor Suggested Retail Price FS 91 DSRP:  $369.95

A professional bike-handle trimmer with simplified starting, improved air filtration and 30% longer run time than the FS 90.

The STIHL FS 91 trimmer delivers power and comfort for landscaping professionals. Its bike-handle design is great for mowing applications – and it’s more comfortable than ever thanks to redesigned rubberized grips. The trimmer also features one touch stop and a simplified starting procedure enabled by the semi-automatic choke lever. Its low-emission engine is paired with a larger fuel tank, improv...Read More
Print Spec Sheets
FS 91 Specifications
DISPLACEMENT 28.4 cc (1.73 cu. in.)
ENGINE POWER 0.95 kW (1.27 bhp)
WEIGHT* 5.8 kg (12.8 lbs.)*
FUEL CAPACITY 710 cc (24.0 oz.)
POWER SOURCE Gas
*Without deflector and cutting attachment.
Model Features
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    Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

    More Information

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    Reduced-Emission Engine Technology - Caring for Nature
    The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards.

    More Information

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    Shoulder Strap / Carrying System
    Using a shoulder strap or carrying system helps distribute the weight of the equipment for increased operator comfort and improved maneuverability.
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    Bike Handle
    When used in conjunction with a harness, the bike handle allows the machine to be easily guided, enabling a smooth horizontal mowing action to cover large areas quickly and efficiently. With soft grips for increased comfort, the bike handle provides greater control and helps reduce operator fatigue.

    See it in action!
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    Multi-Function Control Handle
    Having easy access to all of the controls on one comfortable handle makes it easy to complete tasks so the operator’s hand never has to leave the handle.
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    Tool-Free Handle Adjustment
    The central wing nut enables easy adjustment without the use of tools. For transportation and space-saving storage, the handle can be rotated 90°.
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    Cutting Heads & Blades Selection Chart
    Need help selecting a cutting head or blade for your STIHL trimmer or brushcutter?

    Click here to view the Cutting Heads & Blades Selection Chart (PDF Format).
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    Purge Pump Primer
    By pressing the bulb, this small fuel pump delivers fuel to the carburetor, reducing the number of starting pulls needed after an extended break between uses.
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    Fully Lined Drive Shaft
    Provides smooth operation and less vibration.
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    High Tech Polymer Housing
    Housings are lightweight, withstand greater impact and are corrosion-resistant.
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    Protected Choke Lever/Knob
    Helps prevent damage.
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    Start/Run/Stop Controls on Handle
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    Throttle Trigger Interlock
    Must be depressed before the trigger can be activated.
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    Air Filter Cover
    Easily removed for fast and easy filter cleaning or replacement.
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    Protected or Enclosed Control Cables
    Eliminate dangling and loose wires.
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    Heavy-Duty Steel-On-Steel Clutch
    Centrifugal clutch is designed to reduce slippage.
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    Protected Spark Plug
    Protected yet easy to change.
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    Protected Spark Arrestor Muffler
    Has large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks.
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    Upright Translucent Fuel Tank
    Allows operator to easily check fuel level before starting work. Upright position makes it easier to refill.
Standard Features
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    Common Features for Trimmers
    View the features common to many STIHL trimmers.

Important Information
WARNING! Improper use of any trimmer/brushcutter can cause serious or fatal injury. Read, understand and follow all safety instructions in your instruction manual. To reduce the risk of injury from blade contact, circular saw blades may be used on FS brushcutters that have a limitstop, a bicycle handle and double shoulder harness and not on FS brushcutters with a "J" handle or loop handle. Other rigid blades may be used on FS brushcutters having a bicycle handle, a "J" handle or a loop handle equipped with a barrier bar. To reduce the risk of eye injury always wear proper eye protection. Always use the appropriate deflector for the type of cutting attachment, as explained in your instruction manual.
Note: STIHL engine products with the Caring for Nature logo are cleaner than EPA Standards for exhaust emissions.
Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…
WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
Click to view the STIHL Limited Warranty Time Periods
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    •2.6 oz. bottle makes 1 gallon mix

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    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

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    The latest advance in gasoline can technology is here with No-Spill® fuel containers. Featuring a special treated body for low permeation, thumb-button flow controls for easier pouring, and a wide and stable base design to reduce upsets, No-Spill® fuel containers help ensure that the gasoline goes into your tank, not on the ground or into the air. Fill even smaller-sized tanks without spilling – flow stops automatically when the tank becomes full. With 1¼-gallon, 2 ½-gallon and 5-gallon sizes available, you’re sure to find one that fits your needs. Ask your local STIHL Dealer about No-Spill® fuel containers. Don’t settle for anything less.

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For Your Safety
  • STIHL® Pro Mark™  Hearing Protector Zoom
    STIHL® Pro Mark™ Hearing Protector
    Padded stainless steel spring wire headband maintains constant pressure. Easy to adjust. Noise Reduction Rating (NRR): 29. Meets ANSI S3.19-1974 standard.

    Colors available: Camouflage, Orange and Grey
  • Two-Tone Work Glasses Zoom
    Two-Tone Work Glasses
    The lightweight STIHL Two-Tone Work Glasses feature a hollowed-out framework that is lightweight and comfortable to wear. Protect your eyes with ANSI standard Z87.1+ lenses, offering 99% UV protection – so you don’t have to slow down when the sun is beating down. Featuring flexible rubber temple tips and nose pads, the STIHL Two-Tone Work Glasses deliver a soft, comfortable fit for all those tough outdoor tasks that demand your full attention. Stop by our showroom to see them for yourself!
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    Outdoor PRO Gloves
    STIHL Outdoor PRO Gloves feature high-quality synthetic leather for comfort and durability. That durability is enhanced further by TPR (thermoplastic rubber)-padded knuckle and finger areas. Yet the gloves remain lightweight and deliver a high degree of dexterity. The material is also breathable for all-day comfort. Feel the difference for yourself – stop by our Dealership and try them on today.

Are You Ready for a STIHL?

FS 91 is rated 4.6 out of 5 by 8.
Rated 4 out of 5 by from Good product I bought this for my lawn business and it seems to be pretty good. It starts right away after doing all the start up procedure. The only reason I rate 4 stars is because I bought this to last a lot of hours and I have no proof of this yet so I will change review after some time has passed also the product guide was not clear on how to restring it but once I figured it out it was a piece of cake. Overall good experience so far.
Date published: 2017-05-25
Rated 5 out of 5 by from Sthil Fs 91 Love my new sthil fs91 very impressive weedeater lots of power easy to use very light and first of all thanks for my sales person Michelle from rainbow ag in Lakeport Ca thanks for recommending the sthil fs91 never been happy Best weedeater ever I highly recommend this product hats off to sthil great job
Date published: 2017-05-25
Rated 5 out of 5 by from Awesome job with blade at cutting small scrub brush. Had a FS 66 for over 40years and decided time to replace it. Have a FS40 for around the house that works great for grass trimming but needed a straight shaft to do heavy brush cutting. Had to take several breaks while using it. It worked harder than I wanted to. Would buy this product again, maybe in another 40years? Still have a very dependable 028Boss chainsaw I've had for over 40years also, and still us it.
Date published: 2017-05-20
Rated 5 out of 5 by from Still 91 trimmer Great tool very powerful and starts up first pull.
Date published: 2017-05-17
Rated 5 out of 5 by from You feel the quality every time you pick it up. Feels secure, starts like a champ, powerful enough to do more than I need. I'm so glad I took the dealers recommendation. I know it's the last trimmer I'll ever need.
Date published: 2017-05-15
Rated 5 out of 5 by from Stout as a mule Best trimmer that I've ever owned, probably pass it on to my kids and buy new ones when the time comes. Awesome product, STHIL is a name you can trust and is still king of the mountain.
Date published: 2017-05-12
Rated 3 out of 5 by from Hard starting and not as powerful as I had hoped First of all, the product is an FS90 - which the review choices say doesn't exist? Maybe that's part of the problem - I have some sort of expired model. Who knows? Followed the starting instructions to a T and will never start using that procedure. Finally took it back to store, where the guy starts it on first pull. I asked him to show me the procedure before he started - nope, just rips the cord and it starts. Well he did it by holding the throttle wide open. NOWHERE IN THE MANUAL DOES IT SUGGEST THAT. After returning home, the same problem continues - the only way it starts is by holding the throttle wide open - product manual is a joke, or this machine is a lemon. I'm not sure which.
Date published: 2017-04-29
Rated 5 out of 5 by from very nice trimmer sthil had maintanance in mind just got the new still fs 91 it is more well defined than the fs 90 has more to offer I love the design of engine it has a cover held on by one screw to access the valve cover and change the spark plug, it user friendly sthil got this one right , also hats off to my sales person ted for know so much about sthil and taking care of me for every sthil items that I purchase for them that why I love sthil they have the best dealer support out of all competitors thank you sthil for another great product built by hard working Americans, if your looking for a awesome trimmer/brush cutter than look no further than a sthil
Date published: 2017-02-11
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